Organic Vapor Triggered Repeatable On–Off Crystalline-State Luminescence Switching

A nonporous crystalline solid consisting of an organoarsenic platinum­(II) complex, i.e., a mononuclear diiodoplatinum­(II) complex trans-PtI2(cis-DHDAtBu)2 (1) with cis-1,4-dihydro-1,4-dimethyl-2,3,5,6-tetrakis­(tert-butoxycarbonyl)-1,4-diarsinine (cis-DHDAtBu), shows on–off solid-state luminescence switching through reversible solvent vapor uptake and escape. The on–off switching of solid-state luminescence was achieved without changing the structure or electronic state of the organoarsenic platinum­(II) complex.